| Autor: |
Sobolev, Alexey, Presniakov, Igor, Rusakov, Vyacheslav, Alexey Belik, Matsnev, Mikhail, Gorchakov, Dmitry, Glazkova, Iana |
| Předmět: |
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| Zdroj: |
AIP Conference Proceedings; 2014, p104-108, 5p, 1 Chart, 3 Graphs |
| Abstrakt: |
New results of 57Fe Mössbauer studies on BiFeO3 powder sample performed at various temperatures above and below magnetic phase transitions point TN ≅ 640 K are reported. We have performed self-consistent calculations of the lattice contributions to the EFG tensor, taking into account dipole moments of the O2- and Bi3+ ions. Low-temperature 57Fe Mössbauer spectra recorded at T < TN were analyzed assuming an anharmonic cycloidal modulation of the Fe3+ magnetic moments. The cycloidal modulation of the iron spin was described with the elliptic Jacobi function sn[(±4K(m)/λ)x,m]. The good fit of the experimental spectra was obtained for the anharmonicity m = 0.44 ± 0.04 (T = 4.9 K) resulting from the easy-axis magnetic anisotropy. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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